Sandbox

SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '750e1685fa314f0e4021fcb16f9f122f745cb52bf5ec20c77f4751a6d6c52081' 
  AND token = 'uPnklH1/IlhZ2LXextUWae/l4jNi6QESlJt0N0WGAGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}